ISCAR Turning Grades Chart Grades ISO Coating Layers K01-K10 IN11 WHITE CERAMICS S01-S10 H05-H25 IN22 BLACK CERAMICS K05-K10 K05-K15 IN23 BLACK CERAMICS H10-H30 MATERIALS AND GRADES IS6 K01-K10 SILICON NITRIDE IS8 K01-K20 SILICON NITRIDE IS9 S20-S30 SILICON NITRIDE IS80 K01-K20 TiN SILICON NITRIDE K05-K10 IN420 BLACK CERAMICS H05-H25 TiN S20-S30 IW7 WHISKER CERAMICS H05-H25 CERAMICS 560 ISCAR